of columbus



Reissuedl June 25, 1929.

UNITED STATES PATENT oFFlcE.

WILLIAM KELSEY LIGGETT, OF COLUMBUS, OHIO, ASSIGNOR TO JEFFREY MANUFAC- T URING COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO.

PULVERIZING MACHINE.

Original No. 1,621,93, dated March 22, 1927, Serial No. 644,165, med .Tune 8, 1923. Application for reissue filed April 27, 1929.

The present invention relates to certain` new and useful iml'n'owments in pulverizing machines, and particularly to that class of pulrcrziug machines having an element adapted to revolve at high velocity aud provided with a plurality of pivotally mounted radially extending arms adapted to engage and pulverize material, and a Casing arranged to receive the material to be pulverized and retain it within the influence of the rapidly revolving arms until it shall be reduced to the desired degree of iineness.

- The present machine is designed more particularly to reduce fibrous material, such as sugar cane and thelike.

The Vespecial object of this invention is to provide inra machine of the class described,

' improved means for holdingl materialwithin ie'l'ield of action of the rapidly revolving arms to be [mlverized thereby.

A further` object is to provide adjusting means for said holding means whereby the lineness of the product may be regulated.

`'1`l1'ese1arul other objects will be fully disclosed in the'followingspecification, and

illustrated in the accompanying drawings, of

' Fig. 1 is a side elevation of the preferred embodin'ient of my invention.

Flg. 2 1s a cross section taken along the line II-II of Fig. 1.

Fig. 3 is a detail of the devices shown in Figs. 1 and 2.

Like numerals refer to similar parts in the several figures.

As shown in the drawings, my improved pulverizing machine consists of a rotor adapted to revolve at high velocity about a horizontal axis, and mounted within a casing whiehjis adapted Ito confine the material during the process of pulverization. The casing comp-rises a main supporting frame 1 and ahousing 2 which are joined together along the horizontal central plane of the rotor, and which enclose a pulverizing` chamber. The main frame 1 consists of a hollow rectangular casting having longitudinally projecting brackets 3 upony which are mounted suitable journal bearings 4 in which the shaft 5 of theI rotor is journalfed. The rotor is of the well Serial No. 358,742.

volving pulverizing elements. The front wall of4 the pulverizing chamber consists of a vertically extending plate 12 which is pivotally supported at its upper end upon the tie rod 13 which extends between the upper-part of theside walls 9 to secure them 1n spaced relation. The plate 12 extends downwardly substantially to the central horizontal plane of the rotor, and its inner face is protected by the lining plates 14 and 15 which are preferably made of a highly refractory allo. of iron. The plates 14 and 15' are sha e on their outer faces to closely approach t 1e pulverizing surface 7, and thereby form a throat 16 tl'irough which pulverized material may pass. On the plate 14 there is formed a shelf 17 the upper surface of .which lies in a plane extending radially of the rotor, and this shelf acts as an abutment to arrest 'forward movement of material floating upon the pulverizing surface, and it presents a relatively shar edge upon which material will be broken by the action of the pulverizing surface in addition to its disintegration under the action of the pulverizing surface generated lby the rotor. It Will be seen that the abutment 17 inclines downwardly so Y that while it will arrest the unpulverized material and support it in position for action by the pulverizing elements 7, the tendency of the arrested mass will be always to feed downwardly into the field of action of the pulverlizing surface generated by the elements 7.

To the outer surface of the plate 14 are attached two brackets 18 which extend outwardly and downwardly, and are forked at their outer ends to form arms 19 which elnnuts 22 ixed` to the machine frame. By rna.y

nipulation of the bolts 2() the plate 12 may be. swung about the pivot rod 13 to move the lining plates 14 and 'l5 closer to or farther from the j'mlverizing surface, thereby adjusting the width of the throat 1G to control the size of the fragments of the product. A cover plate 23 attached to the end walls 9 of the housing, closes the forward part of the pulverizing chamber and serves to intercept material which may be thrown radially from the pulverizing surface. A grating 24 preferably composed of the longitudinally extending bars 25 is arranged below and in close proximity with the rotor and acts to retain material within the intiuence of the pulvcrizing surface until it is fully pulverized.

In operation fibrous material, such as sugar cane, ensilage, and the like, fed through the opening 26, into the pulverizing chamber, and slides down the feed plate 11 to the pulverizing surface 7a upon which it floats, and b v which it is carried forward to contact with the abutment 17. Fragments are then ground off of the mass by the pulverizing Surface 7, carried through the throat 1G and are` discharged between the grate bars 25. The size of the fragments thus ground oli' will vary with the width of the thloat 16, and the character of the product may be varied by the adjustment of the plate 14 towards or from the rotor. i

From the foregoing it will be seen that apulverizing machine capable of handlingr fibrous and other materials, is provided, in which the mass of the material is maintained above the rotor anld subjected to the pulver-izing action of the' reducing elements as the rotor revolves, without any danger of unpulverized material passing through the machine. The means for arresting the unpulverized material is so disposed that the material naturally gravitates to it, and the arresting means in turn naturally directs the unpulverized material to the rotor for further action. The throat formed by the curved face is so disposed relative to the rotor that only material which has been sufficiently pulverized will pass, and the means for adjust-- ing the abutment and throat forming face enables me to adapt the machine to produce 1avions sizes of material.

What I claim is 1. In a machine of the class described, the combination of a rotor provided with pulverizing elements which generate a sul'istantially continuous pulverizing surface when the rotor is at speed; a casing of substantially cylindrical form closely surrounding the major part of said rotor; a combined hopper and pulvcrizing chamber above said easing with the hopper portion disposed on the up wardly advancing side and the pulveriziug l chamber ou the downwardly advancing side of said rotor. said pulverizing chamber having a substantially vertical wall tangenti-ally 17,334 @wenn disposed relative to the path of .rotfiion of said pulverizng elements; au abutment at the lower end of said vertical Wall substantially filling the throat between the tangentially vertical wall and said rotor, to intercept the downwardly gravitating unpulverized materi al and prevent its passing through the machine; and means to adjust said abutment.

2. In a machine of the class` described, the combination of a rotor provided with pulverizing elements which generate a substantially continuous pulverizing surface when the rotor is at speed; a casing of substantially cylindrical form closely surrounding the major part of said rotor; a combined hopper and pulverizing chamber above said casing with the hopper portion disposed on the upwardly advancing side and the j )ulverizing chamber on the downwardly advancing side of said rotor, said pnlverizing chamber having a substantially vertical wall tangcntially disposed relative to the path of rotation of said pulverizing elements, means for adjust,- ing said wall toward and from the path of rotation of said pulverizing elements, and an abutment at the lower end of said vertical wall substantially filling the throat between the tangentially vertical wall and said rotor, to intercept the downwardly gravitating, unpulverized material and prevent its passing through the machine.

3. In a machine of the class described, the combination of a rotor provided with pulverizing elements which generate a substantially continuous pulverizing surface when the rotor is at speed; a casingof substantially cylindrical form closely surroumling the major part of saidrotor; a combined hopper and pulverizing cl'iamber above said casing with the hopper portion disposed on the, upwardly advancing side and the pulverizing chamber on the downwardly advancing side of said rotor, said pulverizing chamber having a sul'istant'ially vert-ical. wall tangentially disposed relative to the path of rotation of said pulverizing elements; a swing mount ing at the top of said wall; means for adjusting said wall on its swing mounting; and an abutment having a downwardly inclined upper face anda curved face below said inclined face closely adjacent the Vpath of said pulverizing elements to fill the throat. between the tangentially vertical wall and said rotor, to intercept the downwardly gravita( ing, unpulverized material and prevent its passing through the machine. j

4. In a machine of the class described. the combination with a pulveriziug rotor, a screen casing closely surrounding a major part of' said rotor and having a. pulveriziug chamber` throat illing means at the 'forward side. of said chamber to arrest. and return to the pulverizing rotor unpulverize-d material. aud means to adjust said material arresti ug means to and from the rotor.

and ret-urn unpulverized material to the rotor, a curved face below said inclined surface closely adjacent the path ot' the rotor to form a throat for pulverizcd material, and means for adjusting said abutment and said vcurved face relative to said rotor.

6. In a machine of the class described, the combination of the pulverizing rotor, a screen casing closely/surrounding a major part of said rotor and having a pulverizing chamber above said rotor, a movable wall at the far side of said chamber, a throat filling abutment projecting inwardly from said movable wall and having an upper surface inclined toward the rotor to arrest and return unpulverized material to said rotor, a curved face below said inclined surface arranged close to the path of rotation `of said krotor to form a throat for the pulverized material, and means for adjusting said movable wall rela tive to said rotor.

7. In a machine ofthe class described, `the combination of a pulverizing rotor, a screen casing closely surrounding a major part of said rotor and having a pulverizing chamber entirely above said rotor provided with a feed opening, a top for said chamber to prevent material being thrown out by therotor, a pivoted wall at the far side of said chamber, a throat filling abutment projecting inwardly from said wall at a point below the top of said rotor and provided with a surface inclined inwardly toward said rotor to arrest and return unpulverized material to said rotor, a curved face below said inclined surface to form with said rotor a throat for the pulverized material, and adjusting means mounted on the wall of the casing and engaging the lower end of said pivoted wall to vary the position of said wall, abutment and curved face relative to said rotor.

8. In a machine of the class described, the combination of a rotor, a plurality of reducing elements disposed eircumferentially ot said rotor and which, when the rotor is in motion, generate a substantially continuous, revolving material-supporting surface; a, hopper for the material to be reduced arranged above and closely embracing at its lower end said rotor to retain the material in floating condition on said rotor and to prevent oversize material passing between said rotor and the lower end of said hopper; and a hopperprotecting lining having at its lower end a material-engaging abutment projecting in substantially radial lines close to the path of rotation of said rotor. f

9. In a machine of the class described, the

combination of a movable member, a plurality of reducing members carried by said mem# ber, and which, when the member is in motion, generate a substantially continuous, moving, material-engaging surface, a hopper for the material to bc reduced closely embracing at its end, said movable member and reducing elements to retain the material in floating condition. on said reducing meml'ier, and to prevent oversize material passing between said reducing elements and the end ol? said hopper, and a material engaging abut ment projectingr close to the path ot movement of said reducing elements, said abutment being mounted for adjustment toward and away from said path of movement.

10. In a machine of the class described, the combination of a movable member, a plural.- ity of reducing members carried by said men1- ber, and which, when the member is in motion, generate a substantially continuous, moving, material-engaging surface, a hopper for the material to Ybe reduced closely embracing at its end, said vmovable member and rcducing elements to retain the material .in floating condition on said reducing member, and to prevent oversize material passing between said 'reducing elements and the end of said hopper, and a. material engaging abut ment projecting in substantially radial lilies close to the path of rotation of said rotor, said abutment being mounted for ad justmcnt toward and away from said path of movcment. c

1l. In a machine of the class described, the combination of a movable member, a plurality of reducing members carried by said member, and which, when the member is in motion, generate a substantially continuous, moving, material-engaging surface, a hopper for the material to be reduced closely embracing at its end, said movable member and reducing elements to retain the material in floating condition on said reducing member, and to prevent oversize material passing between said reducing elements and the'end of said hopper, and a material-engaging abutment projecting close to the path of movement of said reducing elements, said abutment being swingably mounted for adjustment toward and away from said path of movement.

12. In a machine of the class described, the combination of a movable member, a plurality of reducing members carried by said member, and which, when the member is in motion, generate a substantially continuous, moving, material-engaging surface, a hopper for the material to be reduced closely embracing at its end, said movable member and reducing elements to retain the material in floating condition on said reducing member, and to prevent oversize material passing between said reducing elements and the end of said hopper, and a material-engaging abutment projecting in substantially radial lines close to the path of rotation of said rotor, said abutment being swingably mounted for adjustment toward and away from said path of movement.

13. In a machine of the class described, the combination of a rotor; a plurality of reducing elements disposed circumferentially of sind rotor and which, when the rotor is in motiou, generate a substantially continuousre volving materi:1l-supporting surface; a hopper for the material to be reduced arranged above and closely embracing at its lower extremities said rotor to retain the material in floating condition upon said rotor and to prevent oversize material passing between said rotor and the upper extremities; said hopper including a substantially vertical wall at its forward side, and an abutment extending transversely of said wall at its lower portion, saidabutment having a top face extending in close proximity to said material-supporting surface, and a front face of substantiall vertical extent lying closely adjacent an substantially conforming'to said material-supporting surface. n

14. In a machine of the class described, the combination of a rotor; a plurality of reducingv elements disposed circumferentially of said rotor and which, when the rotor is in motion, generate a substantially continuous, rcvolving material-supporting surface; a hopper for the material to be reduced arranged above and closely embracing at its lower extremities said rotor to retain the material in fioating condition upon said rotor and to prevent oversize material passing between said rotor and the upper extremities; said hopper including a substantially vertical wall at its forward side, and an abutment extending transversely of said wall at its lower portion,

-said abutment having a top` face extending per for the material to be reduced arranged above and closely embracing at its lower extremities said rotor to retain the material in floating condition on said rotor'and to prevent oversize material passing between said rotor and the lower end of said hopper; said hopper including a substantially vertical wall at its forward side, and an abutment extending transversely of said wall at its lower portion; said abutment having a front face extending upwardly a distance from adjacent the horizontal axial plane of the rotor in substantial conformity close to said material-supporting surface, and a top face sloped downwardly to said front face.

WILLIAM KELSEY LIGGETT. 

